This prefab produces heatmaps, density grids and similar displays.
Data can be continuous numeric or categorical. Numeric data will be fitted into bins.
Instance counts are displayed unless contentfield is specified.
The binsizes and color breakdown can be automatically determined or
specified explicitly for faster performance.

Parameters

Most of the standard prefab parameters may be used.
You must specifydata (the name of the input data file).
The clickmap parameters and ptselect aren't available with this prefab.
You can't do an x axis along the top or a Y axis along the right side with this prefab.

If yes, indicates that X component is categorical, not continuous numeric.

xcats=yes

xbinsize

ybinsize

numeric

based on data

Explicitly specify bin size for continuous numeric data.
If not specified these will be determined automatically, at some cost in performance.

ybinsize=2.5

cutofflist

commalist of numerics

based on data

Explicitly specify the cutoffs for color breakdown.
commalist is a comma-delimited list of numeric values, from large
magnitude to small. If not specified a reasonable (but probably not ideal) breakdown
of 6 color categories will be provided automatically, at some cost in performance.
commalist cannot contain embedded spaces.

Specify the colors to be used for cells.
The first color in commalist will go to the highest magnitude category.
There must be one color specified for each category.
commalist may not contain embedded spaces.

If specified, indicates that instances are not to be counted, but instead, the
value in this field will determine the color for a given cell. Thus with
contentfield only one data row (the last one encountered) will control the color of any given cell.